diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 75a4e5f..d21daa0 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -10908,6 +10908,12 @@ simplify_comparison (code, pop0, pop1) represents the low part, permute the SUBREG and the AND and try again. */ if (GET_CODE (XEXP (op0, 0)) == SUBREG + /* It is unsafe to commute the AND into the SUBREG if the SUBREG + is paradoxical and WORD_REGISTER_OPERATIONS is not defined. + As originally written the upper bits have a defined value + due to the AND operation. However, if we commute the AND + inside the SUBREG then they no longer have defined values + and the meaning of the code has been changed. */ && (0 #ifdef WORD_REGISTER_OPERATIONS || ((mode_width @@ -10919,16 +10925,6 @@ simplify_comparison (code, pop0, pop1) <= (GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (XEXP (op0, 0)))))) && subreg_lowpart_p (XEXP (op0, 0)))) -#ifndef WORD_REGISTER_OPERATIONS - /* It is unsafe to commute the AND into the SUBREG if the SUBREG - is paradoxical and WORD_REGISTER_OPERATIONS is not defined. - As originally written the upper bits have a defined value - due to the AND operation. However, if we commute the AND - inside the SUBREG then they no longer have defined values - and the meaning of the code has been changed. */ - && (GET_MODE_SIZE (GET_MODE (XEXP (op0, 0))) - <= GET_MODE_SIZE (GET_MODE (SUBREG_REG (XEXP (op0, 0))))) -#endif && GET_CODE (XEXP (op0, 1)) == CONST_INT && mode_width <= HOST_BITS_PER_WIDE_INT && (GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (XEXP (op0, 0)))) |